musashino tsuko

Power Supply Manufacturers
Server and Telecom Power Supply Manufacturers
Semiconductor Equipment, Medical Device, and Industrial Robot Manufacturers

LLC Resonant Converter Circuits
High-Efficiency, High-Density DC-DC Converters
Equipment Downsizing and Performance Enhancement
Reduced Inductance Tolerance
Minimized Leakage Inductance

Struggling with selecting switching (flyback) transformers for your LLC resonant power circuits?
◆ Large variation in transformer leakage inductance
◆ Wide fluctuation in magnetizing inductance
◆ Inconsistent output under heavy load
◆ Long lead time for custom transformers requiring gapped core processing
◆ Unstable characteristics of transformers with gapped cores

Musashino Tsuko has the expertise to solve these challenges!
★ We developed our own automatic ferrite core grinding machine to perform high-precision gap processing—achieving tight control over inductance tolerance.
★ Our proprietary winding methods allow us to commit to your specified values for leakage inductance, magnetizing inductance, and switching frequency—with low tolerance.
★ In-house core processing eliminates dependence on external suppliers, enabling fast prototype delivery.
★ We keep a wide range of custom winding materials in stock—including litz wire and copper foil—for quick turnaround from prototyping to delivery.

Power supply manufacturers (Switching power supplies, UPS, etc.)

Motor drive and inverter manufacturers (industrial machinery, EVs, elevators, etc.)

HVAC and refrigeration equipment manufacturers (heat pumps, compressor control systems, etc.)

Solar power generation and energy storage system manufacturers (PCS, power conditioners)

Machine tool and industrial equipment manufacturers (servo and inverter-equipped machines)

Harmonic current absorption and attenuation
 → Installed in the input stage of power circuits or inverters to suppress 3rd, 5th, and 7th order harmonics.

Power factor correction and equipment protection
 → Improves compatibility with grid power, preventing malfunctions, errors, and unnecessary shutdowns.

Noise suppression (EMI/RFI)
 → Reduces high-frequency noise and minimizes interference with surrounding equipment.

Longer equipment life and stable operation
 → Minimizes heat and vibration, improving the overall reliability of reactors and systems.

"Facing challenges with harmonic mitigation in your power circuits?"
◆ Equipment malfunction or overheating caused by harmonic components in the power circuit
◆ Standard reactors don’t meet the performance required for power factor correction
◆ Struggling to find a compact reactor for space-saving designs
◆ Need a reactor that effectively suppresses noise in high-frequency ranges
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"Musashino Tsuko offers the expertise to solve your challenges!"
★ Optimized attenuation performance through impedance design tailored to your circuit and harmonic frequency
★ Proven high-frequency designs for maximum noise absorption and harmonic suppression
★ Coil designs that minimize loss and heat, ensuring long-term stability and reliability
★ Customizable thin and compact structures for effective space usage within equipment
★ Stable production system enables quick delivery of standard and custom reactors with high quality
◎ We design and manufacture harmonic filter reactors optimized for various power supplies, inverters, and motor drive systems.

Industrial Power Supply Manufacturer
Semiconductor Manufacturer
High-Voltage Medical Device Manufacturer
Water Treatment Engineering Provider

High Current and High Frequency Applications
・EV Charging and Fast Charging
・Semiconductor Manufacturing and Plasma Generation
・Electroplating and Ultrapure Water Production
・Lightning Surge Protection

Facing challenges with high-frequency transformer or choke coil selection?
◆ Excessive heat generation and core loss
◆ Poor magnetic coupling or large leakage inductance
◆ Difficulty selecting the right litz wire structure
◆ Inadequate DC bias performance

Musashino Tsuko provides expert solutions!
★ Skin effect mitigation
 Minimizing current distortion using fine-stranded litz wire conductors.
★ Improved magnetic coupling
 Our original “sandwich winding” technique enhances coupling efficiency.
★ Optimized litz wire design
 Based on extensive testing, we propose ideal strand diameter, turns, and layout for minimal heat and high efficiency.
★ Material selection & precision gapping
 We offer ferrite, dust core, amorphous, and other magnetic materials suited to your frequency range.
 In-house gap machining achieves tight inductance tolerance with high accuracy.

◎ We design and manufacture custom transformers and choke coils optimized for high-frequency, high-current applications—perfect for power conditioners, plasma equipment, motor inverters, and more.

High Voltage Unit Manufacturers
Semiconductor Equipment Manufacturers
Ozone Generator Manufacturers
Ultraviolet Irradiation Equipment Manufacturers
X-ray Analysis Equipment Manufacturers
Medical Device / X-ray Equipment / Diagnostic Equipment Manufacturers
Accelerator Power Supply Manufacturers

High-voltage power modules (e.g., laser power supplies, space development, etc.)
Semiconductor manufacturing equipment (ion implantation, ionization, acceleration)
Ozone generation and ozone injection
Ultraviolet irradiation (electron acceleration)
Ultrapure water production
Particle acceleration and plasma generation

Struggling to select the right transformer for your high-voltage power supply?
◆ Short lifespan of transformers used in high-voltage applications
◆ Difficulty finding manufacturers willing to develop custom high-voltage transformers
◆ No manufacturer able to quantitatively evaluate corona discharge

Musashino Tsuko has the expertise to solve these challenges!

★ Proven track record of reducing corona discharge to just a few pico-coulombs in high-voltage transformers using our original molded construction method.
★ Our proprietary winding techniques effectively prevent rare shorts. Compliant with various safety standards, our transformers are already used in medical devices.
★ We also offer full customization of units—including shape and voltage rating—from design and prototyping through to mass production, all under one roof.

If you have any questions, please don’t hesitate to contact us.

Power Supply Manufacturer
Server Power Supply , Telecom Power Supply Manufacturer
Semiconductor Equipment, Medical Device, and Industrial Robot Manufacturer

Higher Performance and Space Saving
Medical Standard Certification

Facing challenges with power supply miniaturization or transformer certification?
◆ Traditional transformers are too large to meet product downsizing demands
◆ Difficult to source transformers compliant with medical equipment standards
◆ No manufacturer offers full support from design to certification
Musashino Tsuko has the expertise to solve your concerns!
★ Replacing conventional EI transformers with NCW or OI types can reduce size and weight by up to half!
★ NCW transformers are ideal for medical power supplies and compliant with IEC standards 60601-1 and 61558-1. They offer low leakage current and a compact, lightweight, low-profile design.
★ Widely adopted as compact step-up transformers for medical X-ray generators. Also suitable for Cockcroft-Walton circuits in high-voltage power supplies.
★ OI transformers fit within a 1DIN footprint—proven track record in measuring instruments and power systems.
★ Our compact, low-profile, low-leakage transformers are highly rated by customers looking to upgrade their systems.
If you have any questions, please feel free to contact us.